Burglar-alarm.



No. 704,247. Patnted July 8, I902.

c. FRUEHAUF.

BUBGLAR ALARM.

(Application filed Dec. 26, 1901.)

(No Model.) 2 Sheets-Sheet l.

No. 704,247. Patented July 8, I902.

C. FRUEHAUF.

BUBGLAR ALARM.

(Application filed Dec. 26, 1301.)

(No Model.) 2 Sheets-8heet 2.

Jf 4 J'L if 7{ Jim -.1 d i A I I nae/705471 I citizen of the UnitedStates, residing at Chitails of the construction.

UNiTnn STATES PATENT Orricn.

CHARLES FRUEHAUF, OF CHICAGO, ILLINOIS.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 704,247, dated July 8,1902. Application filed December 26, 1901. Serial No. 87,333- (Nomodel.)

To all whom it may concern:

Be it known that 1, CHARLES FRUEHAUF, a

cago, in the county of Cook and. State of Illinois, have invented newand useful Improvements in Burglar-Alarms, of which the following is aspecification.

My object is to provide an electric burglaralarm of improvedconstruction for doors, windows, and the like, and which when set willcause an alarm to be given on the initial movement of the door-knob orother attachment of the door, window, or the like.

My invention consists in the general construction of the mechanism Iemploy, as well as in details of construction and'combinations of parts,all as hereinafter described and claimed.

Referring to the drawings, Figure l is a broken perspective view of adoor with my invention applied thereto in one convenient way; Fig. 2, aview in elevation of the same and showing the alarm mechanism out ofaction and the door-knob attachment in different positions; Fig. 3, anenlarged partly-sectional front elevation of the alarm device with thefront removed; Fig. 4, a sectional view of the device, taken on line 4in Fig. 3; and Fig. 5, a broken perspective view of a swinging lever andoperating-rod forming de- A is a door, and B a turning door-knob and itsshank.

C is a casing, having a back wall a, side walls 1), base 0, top cl,front upper wall 6, and doorf. Fastened upon the back wall a near thetop thereof in the casing is a rod g, upon which is pivoted avertically-swinging 1e- Ver D, consisting of side bars g g and end bar gExtending forward from the center of the bar 9 is a finger 9 whichprojects through an opening c in the front of the casing.

E is a vertical rod pivotally secured at its upper end to the bar g andpassing downward through an opening a in the base 0. At its lower endthe rod is bent to a right angle and carries a vertically-disposedantifrictionroller E. Above and parallel with the pin or rod g is a pinit, journaled in the sides I) and carrying a block F, provided on itsunder side with downward-projecting hooks or contacts '2 t', the blockbeing weighted to normally depress the hooks out of contact with thebatteryterminals presently to be described. The block F rests upon thelever D. On the rod E above the base cis ashoulder E 7, and surroundingthe rod and confined between the shoulder and base 0 is a spring E whichtends normally to raise the lever D and block F upon the pivots g It. Inthe casing is an electric battery or pair of batteries H H, havingupward-projecting hookshaped terminals 7t, extending into the paths ofthe hooks or contacts i. The contacts 2' connect, as shown, with amagneto bell-ringer I on the top of the casing, which when in circuitsounds a bell or pair of bells K, also on the casing.

L is a door-knob attachment comprising an arm Z and a sectional collarZ. The sections of the collar Z are hinged together at Z to open andpass around the shank of the doorknob and are provided at the oppositeside .with a pair of perforated ears Z to receive a nut-bolt whichclamps the attachment firmly to the shank of the door-knob. On the topof the arm I is a laterally-projecting finger m, having an elongatedslot m, at which it is secured by means of a screw m to the arm Z. Theelongated slot on permits the finger to be adjusted to extend more orless laterally from the arm.

The rod E and attendant parts are out of action when in the positionshown in the drawings and are held out of action against the resistanceof the spring E When it is desired that the alarm shall not be sounded,a catch M, suspended from the casing, is inserted between a shoulder Eon the rod E and the base 0 of the casing, as shown in Fig. 2. When itis desired to place the alarm device in operation, the catch M isremoved and the roller E caused to rest against the under side of thefinger on on the knob attachment. L. When the knob is turned in eitherdirection, as indicated in Fig. 2, the finger-m releases the roller E,and the rod E is raisedby the spring E until the contactsi engage theterminal hooks it. This closes the battery-circuit and causes the bell Kto be sounded by the magneto bell-ringer.

In the construction shown the top (Z of the casin g projects forwardfrom the front and is provided on its under side with a push-button N,from which wires may extend to an electric alarm in any part of thehouse or in a police-station. The push-button is in the path of thefinger g and is actuated by the latter when the lever D is raised asdescribed.

In practice the casing C may be located in any convenient position upona door or window casing, and the attachment to engage the rod E when thedevice is set and which releases the rod when the door-knob, door, orwindow is moved may be of any convenient form suitable for the purpose.

When the device is used upon the front door of a house, I prefer to havethe alarm sounded by the initial turning of the doorknob, as described.

The construction shown is particularly simple and desirable for itspurpose; but this construction may be changed in the matter of detailswithout departing from the spirit of my invention as defined by theclaims.

What I claim as new, and desire to secure by Letters Patent, is-- 1. Inan electric burglar-alarm for doors and the like, the combination ofbattery-terminals, a pivoted support, contacts on the support movable toengage the terminals, a spring-pressed rod movable to engage the blockand elevate the contacts into engagement with the terminals, an electriccircuit including an alarm-signal connected with the contacts, and meanson the door for engaging and restraining the rod.

2. In a burglar-alarm for doors and the like the combination of anormally open electric circuit including contacts and an alarm-signal, aseparate normally open distant alarm electric circuit, including acircuit-closer, a swinging lever adapted in its movement in onedirection to elevate the contacts into engagement with the terminals, anarm on the lever arranged to engage the closer of the other circuit, arod for moving the lever and means on the door or the like forrestraining the rod.

3. The combination of a casing, an electric battery in the casing havinghooked terminals lo, swinging lever D in the casing carrying hookedcontacts t in circuit with alarmsounding mechanism, rod E connected withthe lever and extending through a wall of the casing, spring upon therod tending normally to move the lever to cause the contacts '5 toengage the terminals 10 and means for engaging and releasing the rod,substantially as and for the purpose set forth.

CHARLES FRUEI-IAUF. In presence of- ALBERT D. BACCI, WM. B. DAVIES.

